41528c82bc
* Remove the `Flags` type from `Config` API This commit removes the final foreign type from the `Config` API in the `wasmtime` crate. The cranelift `Flags` type is now expanded into various options on the `Config` structure itself, all prefixed with `cranelift_` since they're only relevant to the Cranelift backend. The various changes here were: * The `avoid_div_traps` feature is enabled by default since it seemed that was done anywhere anyway. * Enabling the wasm SIMD feature enables the requisite features in Cranelift as well. * A method for enabling the debug verifier has been added. * A method for configuring the Cranelift optimization level, as well as a corresponding enumeration, has been added. * Assert that `Config` is both `Send` and `Sync`
Wasmtime: a WebAssembly Runtime
A Bytecode Alliance project
Wasmtime is a standalone wasm-only optimizing runtime for WebAssembly and WASI. It runs WebAssembly code outside of the Web, and can be used both as a command-line utility or as a library embedded in a larger application.
To get started, visit wasmtime.dev.
There are Rust, C, and C++ toolchains that can compile programs with WASI. See the WASI intro for more information, and the WASI tutorial for a tutorial on compiling and running programs using WASI and wasmtime, as well as an overview of the filesystem sandboxing system.
Wasmtime passes the WebAssembly spec testsuite. To run it, update the
tests/spec_testsuite submodule with git submodule update --remote, and it
will be run as part of cargo test.
Wasmtime does not yet implement Spectre mitigations, however this is a subject of ongoing research.
Additional goals for Wasmtime include:
- Support a variety of host APIs (not just WASI), with fast calling sequences, and develop proposals for additional API modules to be part of WASI.
- Facilitate development and testing around the Cranelift and Lightbeam JITs, and other WebAssembly execution strategies.
- Develop a native ABI used for compiling WebAssembly suitable for use in both JIT and AOT to native object files.
Including Wasmtime in your project
Wasmtime exposes an API for embedding as a library through the wasmtime subcrate,
which contains both a high-level and safe Rust API, as well as a C-compatible API
compatible with the proposed WebAssembly C API.
For more information, see the Rust API embedding chapter of the Wasmtime documentation.
It's Wasmtime.