Wasker

Wasker is a WebAssembly compiler. Wasker compiles Wasm binary into ELF format binary.　 Currently, Wasker supports WASI preview 1.

What's new with Wasker

There are already software tools that compile Wasm to native binaries.

What's new with Wasker is, Wasker generates an OS-independent ELF file where WASI calls from Wasm applications remain unresolved.

This unresolved feature allows Wasker's output ELF file to be linked with WASI implementations provided by various operating systems, enabling each OS to execute Wasm applications.

Wasker empowers your favorite OS to serve as a Wasm runtime!

Quick Start

Step1: Install Wasker

curl -sSfL https://github.com/mewz-project/wasker/releases/download/v0.1.1/wasker-0.1.1-linux-$(uname -m)-gnu.tar.gz | tar -xzvC /usr/bin/ wasker

Step2: Create Wasm binary

Create any Wasm binary.

example1

Please refer examples for building Wasm from Rust and Go.

git clone https://github.com/mewz-project/wasker.git
cd examples/rust
rustup target add wasm32-wasi
cargo build --target wasm32-wasi

example2

We also provide a pre-build simple Wasm binary.

git clone https://github.com/mewz-project/wasker.git
ls helloworld.wat

Step3: Run Wasker to compile Wasm

example1

$ wasker examples/rust/target/wasm32-wasi/debug/rust.wasm
[2024-03-19T12:10:20Z INFO  wasker::compiler] input: examples/rust/target/wasm32-wasi/debug/rust.wasm
[2024-03-19T12:10:20Z INFO  wasker::compiler] write to ./wasm.ll
[2024-03-19T12:10:20Z INFO  wasker::compiler] write to ./wasm.o, it may take a while
[2024-03-19T12:10:21Z INFO  wasker::compiler] Compile success

example2

wasker helloworld.wat

Step4: Run compiled Wasm

ELF file generated by Wasker is OS-independent: WASI calls from Wasm applications remain unresolved.

Please write your own WASI wrapper for your favorite OS to be linked with Wasker output.

Here, we'll show a tiny example of running Wasker output on Linux.

Link Wasker output and WASI wapper for Linux

gcc -no-pie ./examples/wasi-wrapper/wasi-wrapper-linux.c ./wasm.o -o hello

Run!!

./hello

Also please check Mewz, a unikernel OS which has WASI interface. ELF file generated by Wasker can be executed on Mewz without any modification.

Development

Wasker compiler is based on LLVM (LLVM 15 currently).

Option1 : Use Devcontainer

You can try Wasker on browser via Devcontainer.

Option2 : Build from source

The wasker binary distributed in Quick Start is dynamically linked with GNU libc (support for musl is planned for the future). If pre-build binaries don't work on your system, please build from source.

Clone repository

git clone git@github.com:mewz-project/wasker.git
cd Wasker

Install LLVM locally

The commands are a little different because you need an LLVM binary built for your architecture.

AMD64

mkdir -p dependencies/llvm
wget https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.0/clang+llvm-15.0.0-x86_64-linux-gnu-rhel-8.4.tar.xz -O /tmp/llvm-15.0.0.tar.xz
tar -xvf /tmp/llvm-15.0.0.tar.xz -C dependencies/llvm
export LLVM_SYS_150_PREFIX=$PWD/dependencies/llvm/clang+llvm-15.0.0-x86_64-linux-gnu-rhel-8.4

AArch64

mkdir -p dependencies/llvm
wget https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.0/clang+llvm-15.0.0-aarch64-linux-gnu.tar.xz -O /tmp/llvm-15.0.0.tar.xz
tar -xvf /tmp/llvm-15.0.0.tar.xz -C dependencies/llvm
export LLVM_SYS_150_PREFIX=$PWD/dependencies/llvm/clang+llvm-15.0.0-aarch64-linux-gnu

Run Wasker

cargo run helloworld.wat