• Install Go.
• Install WASM prototype if you want to execute the code produced by gowasm.

If you're familiar with Go, you probably don't need any of these instructions but if you're new to Go, these copy and paste instructions may be a good start.

Create a new directory and assign it to a variable $GOWASM:

export GOWASM=[directory of your choice]
mkdir -p $GOWASM

Set up $GOPATH and fetch the gowasm project from github:

export GOPATH=$GOWASM
cd $GOWASM
mkdir src
cd src
git clone https://github.com/cierniak/gowasm.git

Compile and run gowasm:

cd $GOWASM
go install gowasm
bin/gowasm src/gowasm/tests/fac/fac.go

You can "link" multiple source files into a single WASM module by specifying all source files as arguments, e.g.,

bin/gowasm src/gowasm/rt/gc/gc.go \
  src/gowasm/tests/mem/mem.go \
  src/gowasm/tests/i32/i32.go \
  src/gowasm/tests/fac/fac.go

To see the list of available command line options, run:

bin/gowasm --help

If you installed the interpreter from the spec repo (see prerequisites), you can run the generated code with:

wasm -t out.wast

You can run the tests compiled by the standard Go compiler to compare the output to that obtained by gowasm:

cd $GOWASM
go run src/gowasm/tests/main.go