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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.
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//! This example shows you how to define ops in Rust and then call them from
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//! JavaScript.
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use deno_core::Extension;
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use deno_core::JsRuntime;
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use deno_core::RuntimeOptions;
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fn main() {
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let my_ext = Extension::builder("my_ext")
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.middleware(|op| match op.name {
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"op_print" => op.disable(),
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_ => op,
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})
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.build();
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// Initialize a runtime instance
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let mut runtime = JsRuntime::new(RuntimeOptions {
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extensions: vec![my_ext],
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..Default::default()
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});
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// Deno.core.print() will now be a NOP
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runtime
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.execute_script_static("<usage>", r#"Deno.core.print("I'm broken")"#)
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.unwrap();
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}
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