Converting WASM into C

WABT has a wasm2c converter that converts WASM into C source code and a header.

Let's create a simple.wat file:

$ touch simple.wat

Add the following contents to simple.wat:

(module
    (func $uanswer (result i32)
        i32.const 22
        i32.const 20
        i32.add
    )
)

wat here defines a uanswer function that adds 22 and 20 to give 42 as the answer. Let's create a WebAssembly binary using wat2wasm:

$ /path/to/build/directory/of/wabt/wat2wasm simple.wat -o 
  simple.wasm

This generates the simple.wasm binary. Now, convert the binary into C code using wasm2c:

$ /path/to/build/directory/of/wabt/wasm2c simple.wasm -o 
  simple.c

This generates simple.c and simple.h.

Note

Both simple.c and simple.h might look huge. Remember this is an autogenerated...