mirror of
https://github.com/denoland/deno.git
synced 2024-12-27 01:29:14 -05:00
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.
27 lines
710 B
Rust
27 lines
710 B
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
|
|
//! This example shows you how to define ops in Rust and then call them from
|
|
//! JavaScript.
|
|
|
|
use deno_core::Extension;
|
|
use deno_core::JsRuntime;
|
|
use deno_core::RuntimeOptions;
|
|
|
|
fn main() {
|
|
let my_ext = Extension::builder("my_ext")
|
|
.middleware(|op| match op.name {
|
|
"op_print" => op.disable(),
|
|
_ => op,
|
|
})
|
|
.build();
|
|
|
|
// Initialize a runtime instance
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
extensions: vec![my_ext],
|
|
..Default::default()
|
|
});
|
|
|
|
// Deno.core.print() will now be a NOP
|
|
runtime
|
|
.execute_script_static("<usage>", r#"Deno.core.print("I'm broken")"#)
|
|
.unwrap();
|
|
}
|