59258730c2
This commit refactors the Wasmtime CLI tools to use `structopt` instead of `docopt`. The `wasmtime` tool now has the following subcommands: * `config new` - creates a new Wasmtime configuration file. * `run` - runs a WebAssembly module. * `wasm2obj` - translates a Wasm module to native object file. * `wast` - runs a test script file. If no subcommand is specified, the `run` subcommand is used. Thus, `wasmtime foo.wasm` should continue to function as expected. The `wasm2obj` and `wast` tools still exist, but delegate to the same implementation as the `wasmtime` subcommands. The standalone `wasm2obj` and `wast` tools may be removed in the future in favor of simply using `wasmtime`. Included in this commit is a breaking change to the default Wasmtime configuration file: it has been renamed from `wasmtime-cache-config.toml` to simply `config.toml`. The new name is less specific which will allow for additional (non-cache-related) settings in the future. There are some breaking changes to improve command line UX: * The `--cache-config` option has been renamed to `--config`. * The `--create-config-file` option has moved to the `config new` subcommand. As a result, the `wasm2obj` and `wast` tools cannot be used to create a new config file. * The short form of the `--optimize` option has changed from `-o` to `-O` for consistency. * The `wasm2obj` command takes the output object file as a required positional argument rather than the former required output *option* (e.g. `wasmtime wasm2obj foo.wasm foo.obj`).
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.