wasm2native

Turn WASI apps into native executables

How it works

The approach is similar to WasmBoxC or RLBox:

WASM file 🠖 WASM to C translator 🠖 platform C compiler + libuvwasi + libuv 🠖 native executable

Prerequisites

• CMake
• Native toolchain (GCC/Clang/MSVC). Optional: Zig

Usage examples

# Single step:
export CC="clang-12"
export LDFLAGS="-fuse-ld=lld"
./build.sh ./examples/coremark.wasm

# Cross-compile with Zig CC: x86_64-windows-gnu, x86_64-linux-gnu, x86_64-macos-gnu
CC="zig cc -target x86_64-linux-musl" ./build.sh ./examples/coremark.wasm

# Cross-compilation to other architectures
# For full targets list: zig targets | jq .libc
CC="zig cc -target aarch64-linux-musl" ./build.sh ./examples/hello.wasm
qemu-aarch64-static hello.elf
Hello from WebAssembly!

Note: this tool can be used for building WASI apps, not emscripten-generated wasm+js output.

Coremark 1.0 results

Intel(R) Core(TM) i5-10400 CPU @ 2.90GHz, single-thread:

• Native: 32475
• wasm2c: 27400 (84% of native)

TODO

• Big-endian target support
• Windows host support
• Convert main script to zig
  • Allow setting CFLAGS, overriding optimization flags
• CI via Github Actions
• Get rid of mandatory CMake dependency (write build script for libuv and uvwasi for major platforms)

License

This project is released under The MIT License (MIT)