e5af0ae3de
This commit removes the `signature_cache` field from the `Store` type and performs a few internal changes which are aimed to be a bit forward looking towards #777, making `Store` threadsafe. The changes made here are: * The `SignatureRegistry` internal type now contains the reverse map that `signature_cache` was serving to do. This is populated on calls to `register` automatically and is accompanied by a `lookup` method as well. * The `register_wasmtime_signature` and `lookup_wasmtime_signature` methods were removed from `Store` and now instead work by using the `Compiler::signatures` field. * The `SignatureRegistry` type was updated to have interior mutability. The global `Compiler` type is highly likely to get shared across many threads through `Store`, so it needs some form of lock somewhere for mutation of the registry of signatures and this commit opts to put it inside `SignatureRegistry` which will eventually allow for the removal of most `&mut self` method on `Compiler`.
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.