wasm-utils/prune/main.rs

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Rust
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2017-09-15 22:01:12 +03:00
extern crate parity_wasm;
extern crate wasm_utils;
extern crate clap;
use clap::{App, Arg};
fn main() {
wasm_utils::init_log();
let matches = App::new("wasm-opt")
.arg(Arg::with_name("input")
.index(1)
.required(true)
.help("Input WASM file"))
.arg(Arg::with_name("output")
.index(2)
.required(true)
.help("Output WASM file"))
.arg(Arg::with_name("exports")
.long("exports")
.short("e")
.takes_value(true)
.value_name("functions")
.help("Comma-separated list of exported functions to keep. Default: _call"))
.get_matches();
let exports = matches
.value_of("exports")
.unwrap_or("_call")
.split(',')
.collect();
let input = matches.value_of("input").expect("is required; qed");
let output = matches.value_of("output").expect("is required; qed");
let mut module = parity_wasm::deserialize_file(&input).unwrap();
// Invoke optimizer
// Contract is supposed to have only these functions as public api
// All other symbols not usable by this list is optimized away
wasm_utils::optimize(&mut module, exports).expect("Optimizer to finish without errors");
parity_wasm::serialize_to_file(&output, module).unwrap();
}