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ed6b60ddbe
Join two independent ops into one. A fast impl of one + a slow callback of another. Here's an example showing optimized paths for latin-1 via fast call and the next-best fallback using V8 apis. ```rust #[op(v8)] fn op_encoding_encode_into_fallback( scope: &mut v8::HandleScope, input: serde_v8::Value, // ... #[op(fast, slow = op_encoding_encode_into_fallback)] fn op_encoding_encode_into( input: Cow<'_, str>, // ... ``` Benchmark results of the fallback path: ``` time target/release/deno run -A --unstable ./cli/tests/testdata/benches/text_encoder_into_perf.js ________________________________________________________ Executed in 70.90 millis fish external usr time 57.76 millis 0.23 millis 57.53 millis sys time 17.02 millis 1.28 millis 15.74 millis target/release/deno_main run -A --unstable ./cli/tests/testdata/benches/text_encoder_into_perf.js ________________________________________________________ Executed in 154.00 millis fish external usr time 67.14 millis 0.26 millis 66.88 millis sys time 38.82 millis 1.47 millis 37.35 millis ```
54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use syn::parse::Parse;
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use syn::parse::ParseStream;
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use syn::Error;
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use syn::Ident;
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use syn::Result;
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use syn::Token;
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#[derive(Clone, Debug, Default)]
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pub struct Attributes {
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pub is_unstable: bool,
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pub is_v8: bool,
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pub must_be_fast: bool,
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pub deferred: bool,
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pub is_wasm: bool,
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pub relation: Option<Ident>,
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}
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impl Parse for Attributes {
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fn parse(input: ParseStream) -> Result<Self> {
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let mut self_ = Self::default();
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let mut fast = false;
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while let Ok(v) = input.parse::<Ident>() {
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match v.to_string().as_str() {
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"unstable" => self_.is_unstable = true,
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"v8" => self_.is_v8 = true,
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"fast" => fast = true,
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"deferred" => self_.deferred = true,
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"wasm" => self_.is_wasm = true,
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"slow" => {
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if !fast {
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return Err(Error::new(
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input.span(),
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"relational attributes can only be used with fast attribute",
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));
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}
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input.parse::<Token![=]>()?;
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self_.relation = Some(input.parse()?);
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}
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_ => {
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return Err(Error::new(
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input.span(),
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"invalid attribute, expected one of: unstable, v8, fast, deferred, wasm",
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));
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}
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};
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let _ = input.parse::<Token![,]>();
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}
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self_.must_be_fast = self_.is_wasm || fast;
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Ok(self_)
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}
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}
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