Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully compatible with WASI and Emscripten.
Install Wasmer with:
curl https://get.wasmer.io -sSfL | sh
Wasmer runtime can also be embedded in different languages, so you can use WebAssembly anywhere ✨:
Wasmer can execute both the standard binary format (.wasm
) and the text
format defined by the WebAssembly reference interpreter (.wat
).
Once installed, you will be able to run any WebAssembly files (including Lua, PHP, SQLite and nginx!):
# Run Lua
wasmer run examples/lua.wasm
You can find more wasm/wat
examples in the examples directory.
Installing Wasmer through wasmer.io
includes
wapm
, the WebAssembly Package Manager.
Wapm allows you to easily download, run, and distribute WebAssembly binaries.
# Install cowsay globally
wapm install -g cowsay
# Run cowsay
wapm run cowsay "Hello, world!"
For more information about wapm, check out the website and this example program.
Wasmer is structured into different directories:
src
: code related to the Wasmer executable itselflib
: modularized libraries that Wasmer uses under the hoodexamples
: some useful examples to getting started with Wasmer
Building Wasmer requires rustup.
To build on Windows, download and run rustup-init.exe
then follow the onscreen instructions.
To build on other systems, run:
curl https://sh.rustup.rs -sSf | sh
Please select your operating system:
macOS
If you have Homebrew installed:
brew install cmake
Or, in case you have MacPorts:
sudo port install cmake
Windows
Windows support is highly experimental. Only simple Wasm programs may be run, and no syscalls are allowed. This means nginx and Lua do not work on Windows. See this issue regarding Emscripten syscall polyfills for Windows.
-
Install Visual Studio
-
Install Rust for Windows
-
Install Python for Windows. The Windows x86-64 MSI installer is fine. Make sure to enable "Add python.exe to Path" during installation.
-
Install Git for Windows. Allow it to add
git.exe
to your PATH (default settings for the installer are fine). -
Install CMake. Ensure CMake is in your PATH.
-
Install LLVM 8.0
Wasmer is built with Cargo, the Rust package manager.
Set Rust Nightly:
rustup default nightly
And install Wasmer
# checkout code
git clone https://github.com/wasmerio/wasmer.git
cd wasmer
# install tools
# make sure that `python` is accessible.
make install
Thanks to spec tests we can ensure 100% compatibility with the WebAssembly spec test suite.
You can run all the tests with:
rustup default nightly
make test
Each backend can be tested separately:
- Singlepass:
make singlepass
- Cranelift:
make cranelift
- LLVM:
make llvm
Each integration can be tested separately:
- Spec tests:
make spectests
- Emscripten:
make emtests
- WASI:
make wasi
- Middleware:
make middleware
- C API:
make capi
Benchmarks can be run with:
make bench-[backend]
# for example
make bench-singlepass
Wasmer is an open project guided by strong principles, aiming to be modular, flexible and fast. It is open to the community to help set its direction.
Below are some of the goals of this project (in order of priority):
- It should be 100% compatible with the WebAssembly spec tests
- It should be fast (partially achieved)
- Support WASI - released in 0.3.0
- Support Emscripten calls (in the works)
- Support Go js ABI calls
If you would like to know how Wasmer works under the hood, please see ARCHITECTURE.md.
Wasmer is primarily distributed under the terms of the MIT license (LICENSE).