wasm-instrument/gas/src/main.rs

extern crate parity_wasm;
extern crate wasm_utils;

use std::env;

fn main() {

    let args = env::args().collect::<Vec<_>>();
    if args.len() != 3 {
        println!("Usage: {} input_file.wasm output_file.wasm", args[0]);
        return;
    }

    // Loading module
    let module = parity_wasm::deserialize_file(&args[1]).expect("Module deserialization to succeed");

    let result = wasm_utils::inject_gas_counter(module);

    parity_wasm::serialize_to_file(&args[2], result).expect("Module serialization to succeed")    
}