Node.js doesn't currently implement `TextEncoder::encodeInto`. I've raised an upstream issue to add it - https://github.com/nodejs/node/issues/26904 - but it's likely to take some time and will be available only in new releases.
In the meanwhile, it's worth noting that Node.js already has `Buffer::write` which has pretty similar semantics, but doesn't require creating an intermediate view using `.subarray` and instead accepts pointer and length directly.
Also, Node.js has `Buffer::byteLength` helper which allows to efficiently retrieve an encoded byte length of a string upfront, and so allows us to avoid a loop with reallocations.
This change takes leverage of these methods by generating an additional Buffer-based view into the WASM memory and using it for string operations.
I'm seeing up to 35% increase in performance in string-heavy library benchmarks.
We have very few tests today so this starts to add the basics of a test
suite which compiles Cargo projects on-the-fly which will hopefully help
us bolster the amount of assertions we can make about the output.
This commit implements [RFC 8], which enables transitive and transparent
dependencies on NPM. The `module` attribute, when seen and not part of a
local JS snippet, triggers detection of a `package.json` next to
`Cargo.toml`. If found it will cause the `wasm-bindgen` CLI tool to load
and parse the `package.json` within each crate and then create a merged
`package.json` at the end.
[RFC 8]: https://github.com/rustwasm/rfcs/pull/8
This commit fixes an erroneous use-after-free which can happen in
erroneous situations in JS. It's intended that if you invoke a closure
after its environment has been destroyed that you'll immediately get an
error from Rust saying so. The JS binding generation for mutable
closures, however, accidentally did not protect against this.
Each closure has an internal reference count which is incremented while
being invoked and decremented when the invocation finishes and also when
the `Closure` in Rust is dropped. That means there's two branches where
the reference count reaches zero and the internal pointer stored in JS
needs to be set to zero. Only one, however, actually set the pointer to
zero!
This means that if a closure was destroyed while it was being invoked it
would not correctly set its internal pointer to zero. A further
invocation of the closure would then pass as seemingly valid pointer
into Rust, causing a use-after-free.
A test isn't included here specifically for this because our CI has
started failing left-and-right over this test, so this commit will
hopefully just make our CI green!
We've always wanted this to be the deterministic, but usage of `HashMap`
for example can accidentally lead to non-determinism. Looks like one was
forgotten and the bindings were nondeterministic by accident as a
result!
This commit deprecates the `--web`, `--no-modules`, and `--nodejs` flags
in favor of one `--target` flag. The motivation for this commit is to be
consistent between `wasm-bindgen` and `wasm-pack` so documentation for
one is applicable for the other (so we don't have to document everywhere
what the translation is between flags). Additionally this should make it
a bit easier to add new targets (if necessary) in the future as it won't
add to the proliferation of flags.
For now the old flags (like `--web`) continue to be accepted, but
they'll be removed during the next set of breaking changes for
`wasm-bindgen`.
* Note that after the game of life tutorial there's also wasm-pack tutorials
* Ensure that the hello world example is clear that webpack isn't
required inline in addition to the text on other pages.
This commit moves our `links` annotation in the `wasm-bindgen` crate to
the `wasm-bindgen-shared` crate. The `links` annotation is used to
ensure that there's only one version of `wasm-bindgen` in a crate graph
because if there are multiple versions then a CLI surely cannot actually
process the wasm binary (as the multiple versions likely have different
formats in their custom sections).
Discovered in #1373 it looks like the usage in `wasm-bindgen` isn't
quite sufficient to cause this deduplication. It turns out that
`wasm-bindgen-shared`, a very core dependency, is actually the most
critical to be deduplicated since its the one that defines the format of
the custom section. In #1373 a case came up where `wasm-bindgen` was
deduplciated but there were two versions of `wasm-bindgen-shared` in the
crate graph, meaning that a `[patch]` for only `wasm-bindgen` wasn't
sufficient, but rather `web-sys` and/or `js-sys` also needed a `[patch]`
annotation to ensure everyone used the right dependencies.
This commit won't actually fix#1373 to the point where it "just works",
but what it does do is present a better error message than an internal
panic of `wasm-bindgen`. The hope is that by moving the `links`
annotation we can catch more errors of this crate graph duplication,
leading to more `[patch]` annotations locally.
Closes#1373
Trying to use a proc macro from a 2018 edition crate in a 2018 edition crate that reexports wasm bindgen's output failed before this commit with "could not find `wasm_bindgen` in `{{root}}`".
This commit was made with
rg " ::wasm_bindgen::" --files-with-matches | xargs sed -i 's/::wasm_bindgen::/wasm_bindgen::/g'
This allows subverting the checks and resolution performed by the
`module` attribute added as part of [RFC 6] and has been discussed in #1343.
Closes#1343
[RFC 6]: https://github.com/rustwasm/rfcs/pull/6
