Go embedding ofWasmtime

ABytecode Alliance project

Installation

go get -u github.com/bytecodealliance/wasmtime-go/v39@v39.0.1

go_repository(    name = "com_github_bytecodealliance_wasmtime_go",    importpath = "github.com/bytecodealliance/wasmtime-go/v39",    version = "v39.0.1",)

Usage

package mainimport ("fmt""github.com/bytecodealliance/wasmtime-go/v39")funcmain() {// Almost all operations in wasmtime require a contextual `store`// argument to share, so create that firststore:=wasmtime.NewStore(wasmtime.NewEngine())// Compiling modules requires WebAssembly binary input, but the wasmtime// package also supports converting the WebAssembly text format to the// binary format.wasm,err:=wasmtime.Wat2Wasm(`      (module        (import "" "hello" (func $hello))        (func (export "run")          (call $hello))      )    `)check(err)// Once we have our binary `wasm` we can compile that into a `*Module`// which represents compiled JIT code.module,err:=wasmtime.NewModule(store.Engine,wasm)check(err)// Our `hello.wat` file imports one item, so we create that function// here.item:=wasmtime.WrapFunc(store,func() {fmt.Println("Hello from Go!")    })// Next up we instantiate a module which is where we link in all our// imports. We've got one import so we pass that in here.instance,err:=wasmtime.NewInstance(store,module, []wasmtime.AsExtern{item})check(err)// After we've instantiated we can lookup our `run` function and call// it.run:=instance.GetFunc(store,"run")ifrun==nil {panic("not a function")    }_,err=run.Call(store)check(err)}funccheck(eerror) {ife!=nil {panic(e)    }}

Contributing

$ git clone https://github.com/bytecodealliance/wasmtime-go

$ cargo build -p wasmtime-c-api

$ ./ci/local.sh /path/to/wasmtime

$ gotest

Release Checklist

$ python3 ci/download-wasmtime.py$ go test

$ git ls-files | xargs sed -i 's/v16/v17/g'$ python3 ci/download-wasmtime.py$ go test

$ rm .gitignore$ python3 ci/download-wasmtime.py$ git add .$ git commit -m 'v39.0.0 release artifacts'$ git tag v39.0.0