Converting WASM into WAST

Sometimes, for debugging or understanding, we need to know what the WASM is doing. WABT has a wasm2wat converter. It helps to convert WASM into WAST format:

$ /path/to/build/directory/of/wabt/wasm2wat add.wasm
(module
  (type (;0;) (func (param i32 i32) (result i32)))
  (func (;0;) (type 0) (param i32 i32) (result i32)
    local.get 0
    local.get 1
    i32.add))

Running the previous command will convert add.wasm back into WAST format and print the output in the console.

If you want to save it as a file, you can do so by using the -o flag:

$ /path/to/build/directory/of/wabt/wasm2wat add.wasm -o new_
  add.wat

This command creates a new_add.wat file.

To check the various options supported by wasm2wat, we can run the following command:

$ wasm2wat --help
usage: wasm2wat [options] filename
 
  Read a file in the WebAssembly binary format, and...