Files

Alex Crichton 0d4bde4ab3 Add a wasmtime::Linker type (#1384 )

* Add a `wasmtime::Linker` type

This commit adds a new type to the `wasmtime` crate, a `Linker`. This
linker is intended to vastly simplify calling `Instance::new` by easily
performing name resolution and incrementally defining state over time.
The goal here is to start down a path of making linking wasm modules in
`wasmtime` a first-class and ergonomic operation. This is highly likely
to evolve over time and get tweaked through releases as we iterate
towards a design well-suited for `wasmtime`, but this is intended to at
least be the initial foundation for such functionality.

This commit additionally also adds a C API for the linker and switches
the existing linking examples to using this linker in both Rust and C.

One piece of future work I'd like to tackle next is to integrate WASI
into the `wasmtime` crate in a more first-class manner. This [`Linker`]
type provides a great location to hook into the instantiation process to
easily instantiate modules with WASI imports. That's a relatively large
refactoring for now though and I figured it'd be best left for a
different time.

Closes #727

2020-03-23 21:02:31 -05:00

src

[wiggle] Don't make generated structs and unions Copy.

2020-03-23 18:01:25 +01:00

wig

Add a wasmtime::Linker type (#1384 )

2020-03-23 21:02:31 -05:00

winx

[wasi-common]: winx now returns io::Error directly (#1243 )

2020-03-09 10:32:01 +01:00

yanix

[wasi-common]: add armv7 support to wasi-common (#1269 )

2020-03-10 19:18:59 +01:00

Cargo.toml

It's wiggle time! (#1202 )

2020-03-20 21:54:44 +01:00

LICENSE

Initial reorg.

2019-11-08 06:35:40 -08:00

LICENSE.cloudabi-utils

Initial reorg.

2019-11-08 06:35:40 -08:00

README.md

Miscelaneous docs updates and fixes. (#1249 )

2020-03-08 16:11:17 +01:00

README.md

`wasi-common`

A Bytecode Alliance project

A library providing a common implementation of WASI hostcalls for re-use in any WASI-enabled runtime.

The wasi-common crate will ultimately serve as a library providing a common implementation of WASI hostcalls for re-use in any WASI (and potentially non-WASI) runtimes such as Wasmtime and Lucet.

The library is an adaption of lucet-wasi crate from the Lucet project, and it is currently based on 40ae1df git revision.

Please note that the library requires Rust compiler version at least 1.37.0.

Supported syscalls

*nix

In our *nix implementation, we currently support the entire WASI API with the exception of socket hostcalls:

sock_recv
sock_send
sock_shutdown

We expect these to be implemented when network access is standardised.

We also currently do not support the proc_raise hostcall, as it is expected to be dropped entirely from WASI.

Windows

In our Windows implementation, we currently support the minimal subset of WASI API which allows for running the very basic "Hello world!" style WASM apps. More coming shortly, so stay tuned!

Development hints

When testing the crate, you may want to enable and run full wasm32 integration testsuite. This requires wasm32-wasi target installed which can be done as follows using rustup

rustup target add wasm32-wasi

Now, you should be able to run the integration testsuite by running cargo test on the test-programs package with test_programs feature enabled:

cargo test --features test_programs --package test-programs

Third-Party Code

Significant parts of our hostcall implementations are derived from the C implementations in cloudabi-utils. See LICENSE.cloudabi-utils for license information.