1 // $ cargo bench --features full,test --bench file
2
3 #![feature(rustc_private, test)]
4 #![recursion_limit = "1024"]
5 #![allow(
6 clippy::items_after_statements,
7 clippy::manual_let_else,
8 clippy::match_like_matches_macro,
9 clippy::missing_panics_doc,
10 clippy::must_use_candidate,
11 clippy::uninlined_format_args
12 )]
13
14 extern crate test;
15
16 #[macro_use]
17 #[path = "../tests/macros/mod.rs"]
18 mod macros;
19
20 #[allow(dead_code)]
21 #[path = "../tests/repo/mod.rs"]
22 mod repo;
23
24 use proc_macro2::{Span, TokenStream};
25 use std::fs;
26 use std::str::FromStr;
27 use syn::parse::{ParseStream, Parser};
28 use test::Bencher;
29
30 const FILE: &str = "tests/rust/library/core/src/str/mod.rs";
31
get_tokens() -> TokenStream32 fn get_tokens() -> TokenStream {
33 repo::clone_rust();
34 let content = fs::read_to_string(FILE).unwrap();
35 TokenStream::from_str(&content).unwrap()
36 }
37
38 #[bench]
baseline(b: &mut Bencher)39 fn baseline(b: &mut Bencher) {
40 let tokens = get_tokens();
41 b.iter(|| drop(tokens.clone()));
42 }
43
44 #[bench]
create_token_buffer(b: &mut Bencher)45 fn create_token_buffer(b: &mut Bencher) {
46 let tokens = get_tokens();
47 fn immediate_fail(_input: ParseStream) -> syn::Result<()> {
48 Err(syn::Error::new(Span::call_site(), ""))
49 }
50 b.iter(|| immediate_fail.parse2(tokens.clone()));
51 }
52
53 #[bench]
parse_file(b: &mut Bencher)54 fn parse_file(b: &mut Bencher) {
55 let tokens = get_tokens();
56 b.iter(|| syn::parse2::<syn::File>(tokens.clone()));
57 }
58