chore(ext/webidl): Add dictionary converter microbenchmark (#17435)

This commits add a `webidl.createDictionaryConverter` converter
microbenchmark.

There are 2 PRs currently open that need a microbenchmark for webidl
dictionary converter. See https://github.com/denoland/deno/pull/16594
and https://github.com/denoland/deno/pull/16407

Closes https://github.com/denoland/deno/issues/17436

1 files changed, 42 insertions, 0 deletions

diff --git a/ext/webidl/benches/dict.rs b/ext/webidl/benches/dict.rs
new file mode 100644
index 000000000..e7df8af62
--- /dev/null
+++ b/ext/webidl/benches/dict.rs
@@ -0,0 +1,42 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+use deno_bench_util::bench_js_sync;
+use deno_bench_util::bench_or_profile;
+use deno_bench_util::bencher::benchmark_group;
+use deno_bench_util::bencher::Bencher;
+
+use deno_core::Extension;
+
+fn setup() -> Vec<Extension> {
+  vec![
+    deno_webidl::init(),
+    Extension::builder("deno_webidl_bench")
+      .js(vec![("setup", include_str!("dict.js"))])
+      .build(),
+  ]
+}
+
+fn converter_undefined(b: &mut Bencher) {
+  bench_js_sync(b, r#"TextDecodeOptions(undefined);"#, setup);
+}
+
+fn handwritten_baseline_undefined(b: &mut Bencher) {
+  bench_js_sync(b, r#"handwrittenConverter(undefined)"#, setup);
+}
+
+fn converter_object(b: &mut Bencher) {
+  bench_js_sync(b, r#"TextDecodeOptions({});"#, setup);
+}
+
+fn handwritten_baseline_object(b: &mut Bencher) {
+  bench_js_sync(b, r#"handwrittenConverter({})"#, setup);
+}
+
+benchmark_group!(
+  benches,
+  converter_undefined,
+  handwritten_baseline_undefined,
+  converter_object,
+  handwritten_baseline_object,
+);
+bench_or_profile!(benches);