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https://github.com/denoland/deno.git
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88bf50c812
This reverts commit d12b039e1a.
It was landed as an experiment and it confirms much faster startup
if not compression is applied.
59 lines
1.4 KiB
Rust
59 lines
1.4 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use deno_core::Snapshot;
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use log::debug;
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use once_cell::sync::Lazy;
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pub static CLI_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
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#[allow(clippy::uninit_vec)]
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#[cold]
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#[inline(never)]
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|| {
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static COMPRESSED_CLI_SNAPSHOT: &[u8] =
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include_bytes!(concat!(env!("OUT_DIR"), "/CLI_SNAPSHOT.bin"));
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let size =
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u32::from_le_bytes(COMPRESSED_CLI_SNAPSHOT[0..4].try_into().unwrap())
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as usize;
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let mut vec = Vec::with_capacity(size);
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// SAFETY: vec is allocated with exact snapshot size (+ alignment)
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// SAFETY: non zeroed bytes are overwritten with decompressed snapshot
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unsafe {
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vec.set_len(size);
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}
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lzzzz::lz4::decompress(&COMPRESSED_CLI_SNAPSHOT[4..], &mut vec).unwrap();
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vec.into_boxed_slice()
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},
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);
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pub fn deno_isolate_init() -> Snapshot {
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debug!("Deno isolate init with snapshots.");
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Snapshot::Static(&CLI_SNAPSHOT)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn runtime_snapshot() {
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let mut js_runtime = deno_core::JsRuntime::new(deno_core::RuntimeOptions {
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startup_snapshot: Some(deno_isolate_init()),
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..Default::default()
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});
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js_runtime
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.execute_script(
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"<anon>",
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r#"
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if (!(bootstrap.mainRuntime && bootstrap.workerRuntime)) {
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throw Error("bad");
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}
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console.log("we have console.log!!!");
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"#,
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)
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.unwrap();
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}
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}
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