wasmtime

Wasmtime sample

This sample shows how to run WebAssembly inside EGo using Wasmtime.

By default, wasmtime-go comes with a library that makes direct syscalls. EGo only supports syscall via libc. To this end, build the wasmtime library with libc backend:

git clone -bv15.0.1 --depth=1 https://github.com/bytecodealliance/wasmtime
cd wasmtime
git submodule update --init --depth=1
RUSTFLAGS=--cfg=rustix_use_libc cargo build --release -p wasmtime-c-api
cd ..

Tell the Go compiler to use it:

CGO_LDFLAGS=wasmtime/target/release/libwasmtime.a ego-go build

Then you can sign and run as usual:

ego sign wasmtime_sample
ego run wasmtime_sample

You should see an output similar to:

[erthost] loading enclave ...
[erthost] entering enclave ...
[ego] starting application ...
Results of `sum`: 3

Note that executableHeap is enabled in enclave.json so that Wasmtime can JIT-compile the WebAssembly.