wasm-as

The wasm-as tool converts WAST into WASM. Let's look at the steps:

1. Let's create a new folder, called binaryen-playground, and go into the folder:

   $ mkdir binaryen-playground
   $ cd binaryen-playground

2. Create a .wat file called add.wat:

   $ touch add.wat

3. Add the following contents to add.wat:

   (module
       (func $add (param $x i32) (param $y i32) 
         (result i32)
           (i32.add
               (local.get $x)
               (local.get $y)
           )
       )
   )

4. Convert the Web Assembly text format into a WebAssembly module, using the wasm-as binary:

   $ /path/to/build/directory/of/binaryen/wasm-as add.wat

This generates the add.wasm file:

00 61 73 6d 01 00 00 00 01 07 01 60 02 7f 7f 01
7f 03...