add in benchmarks for digest code (#3031)

(initial results look good!)

src/wasm-lib/kcl/Cargo.toml

@@ -98,6 +98,10 @@ harness = false
 name = "compiler_benchmark_iai"
 harness = false
 
+[[bench]]
+name = "digest_benchmark"
+harness = false
+
 [[bench]]
 name = "lsp_semantic_tokens_benchmark_criterion"
 harness = false

src/wasm-lib/kcl/benches/digest_benchmark.rs

@@ -0,0 +1,31 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+
+pub fn bench_digest(c: &mut Criterion) {
+    for (name, file) in [
+        ("pipes_on_pipes", PIPES_PROGRAM),
+        ("big_kitt", KITT_PROGRAM),
+        ("cube", CUBE_PROGRAM),
+        ("math", MATH_PROGRAM),
+        ("mike_stress_test", MIKE_STRESS_TEST_PROGRAM),
+    ] {
+        let tokens = kcl_lib::token::lexer(file).unwrap();
+        let prog = kcl_lib::parser::Parser::new(tokens).ast().unwrap();
+        c.bench_function(&format!("digest_{name}"), move |b| {
+            let prog = prog.clone();
+
+            b.iter(move || {
+                let mut prog = prog.clone();
+                prog.compute_digest();
+            });
+        });
+    }
+}
+
+criterion_group!(benches, bench_digest);
+criterion_main!(benches);
+
+const KITT_PROGRAM: &str = include_str!("../../tests/executor/inputs/kittycad_svg.kcl");
+const PIPES_PROGRAM: &str = include_str!("../../tests/executor/inputs/pipes_on_pipes.kcl");
+const CUBE_PROGRAM: &str = include_str!("../../tests/executor/inputs/cube.kcl");
+const MATH_PROGRAM: &str = include_str!("../../tests/executor/inputs/math.kcl");
+const MIKE_STRESS_TEST_PROGRAM: &str = include_str!("../../tests/executor/inputs/mike_stress_test.kcl");