mirror of
https://github.com/denoland/deno
synced 2024-08-25 02:57:22 +00:00
a1764f7690
This is a follow-on to the earlier work in reducing string copies, mainly focused on ensuring that ASCII strings are easy to provide to the JS runtime. While we are replacing a 16-byte reference in a number of places with a 24-byte structure (measured via `std::mem::size_of`), the reduction in copies wins out over the additional size of the arguments passed into functions. Benchmarking shows approximately the same if not slightly less wallclock time/instructions retired, but I believe this continues to open up further refactoring opportunities.
37 lines
840 B
Rust
37 lines
840 B
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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static CLI_SNAPSHOT: &[u8] =
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include_bytes!(concat!(env!("OUT_DIR"), "/CLI_SNAPSHOT.bin"));
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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_static(
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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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