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denoland-deno/core/snapshot_creator.rs

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Rust
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2019-06-04 13:35:51 -04:00
// Note: This is a nearly identical rewrite of core/libdeno/snapshot_creator.cc
// but in Rust.
//
// This snapshot program is considered "basic" because the code being
// snapshotted cannot call ops.
extern crate deno;
use deno::js_check;
use deno::Isolate;
use deno::StartupData;
use std::env;
use std::io::Write;
fn main() {
let args: Vec<String> = env::args().collect();
// NOTE: `--help` arg will display V8 help and exit
let args = deno::v8_set_flags(args);
let (snapshot_out_bin, js_filename) = if args.len() == 3 {
(args[1].clone(), args[2].clone())
} else {
eprintln!("Usage: snapshot_creator <out_filename> <js_filename>");
std::process::exit(1);
};
let js_source =
std::fs::read(&js_filename).expect("couldn't read js_filename");
let js_source_str = std::str::from_utf8(&js_source).unwrap();
let will_snapshot = true;
let mut isolate = Isolate::new(StartupData::None, will_snapshot);
js_check(isolate.execute(&js_filename, js_source_str));
let snapshot = isolate.snapshot().expect("error snapshotting");
let mut out_file = std::fs::File::create(snapshot_out_bin).unwrap();
let snapshot_slice =
unsafe { std::slice::from_raw_parts(snapshot.data_ptr, snapshot.data_len) };
out_file
.write_all(snapshot_slice)
.expect("Failed to write snapshot file");
}