Add real-js subset that passes the parser and bench the first 10 files.

crates/parser/benches/parser.rs

@@ -1,7 +1,11 @@
+use criterion::black_box;
 use criterion::criterion_group;
 use criterion::criterion_main;
 use criterion::Criterion;
 use std::collections::HashMap;
+use std::fs;
+use std::io;
+use std::io::Read;
 
 use bumpalo::Bump;
 use jsparagus_parser::{parse_script, ParseOptions};
@@ -30,5 +34,40 @@ fn parser_bench(c: &mut Criterion) {
     );
 }
 
-criterion_group!(benches, parser_bench);
+fn read_file(path: &str) -> Result<String, io::Error> {
+    let mut f = fs::File::open(path)?;
+    let mut s = String::new();
+    f.read_to_string(&mut s)?;
+    Ok(s)
+}
+
+fn real_js_parse_bench(c: &mut Criterion) {
+    let real_js_path = "./benches/real-js";
+    let count = 10;
+
+    let paths = fs::read_dir(real_js_path).unwrap();
+    let tests = paths
+        .into_iter()
+        .take(count)
+        .map(|p| {
+            let p = p.unwrap().path();
+            let path = p.to_str().unwrap();
+            read_file(path).unwrap()
+        })
+        .collect::<Vec<_>>();
+
+    let options = ParseOptions::new();
+    let mut allocator = Bump::new();
+
+    c.bench_function("parser_real_js_bench", move |b| {
+        b.iter(|| {
+            for program in &tests {
+                let _ = parse_script(&allocator, black_box(program), &options);
+                allocator.reset();
+            }
+        })
+    });
+}
+
+criterion_group!(benches, parser_bench, real_js_parse_bench);
 criterion_main!(benches);