1 files changed, 89 insertions, 0 deletions
diff --git a/bench_util/src/js_runtime.rs b/bench_util/src/js_runtime.rs
new file mode 100644
index 000000000..701849b5a
--- /dev/null
+++ b/bench_util/src/js_runtime.rs
@@ -0,0 +1,89 @@
+use bencher::Bencher;
+use deno_core::v8;
+use deno_core::JsRuntime;
+
+use crate::profiling::is_profiling;
+
+pub fn create_js_runtime(setup: impl FnOnce(&mut JsRuntime)) -> JsRuntime {
+  let mut rt = JsRuntime::new(Default::default());
+
+  // Setup bootstrap namespace
+  rt.execute("bootstrap", "globalThis.__bootstrap = {};")
+    .unwrap();
+
+  // Caller provided setup
+  setup(&mut rt);
+
+  // Init ops
+  rt.execute(
+    "init",
+    r#"
+      Deno.core.ops();
+      Deno.core.registerErrorClass('Error', Error);
+    "#,
+  )
+  .unwrap();
+
+  rt
+}
+
+fn loop_code(iters: u64, src: &str) -> String {
+  format!(r#"for(let i=0; i < {}; i++) {{ {} }}"#, iters, src,)
+}
+
+pub fn bench_js_sync(
+  b: &mut Bencher,
+  src: &str,
+  setup: impl FnOnce(&mut JsRuntime),
+) {
+  let mut runtime = create_js_runtime(setup);
+  let context = runtime.global_context();
+  let scope = &mut v8::HandleScope::with_context(runtime.v8_isolate(), context);
+
+  // Increase JS iterations if profiling for nicer flamegraphs
+  let inner_iters = 1000 * if is_profiling() { 10000 } else { 1 };
+  // Looped code
+  let looped_src = loop_code(inner_iters, src);
+
+  let code = v8::String::new(scope, looped_src.as_ref()).unwrap();
+  let script = v8::Script::compile(scope, code, None).unwrap();
+
+  // Run once if profiling, otherwise regular bench loop
+  if is_profiling() {
+    script.run(scope).unwrap();
+  } else {
+    b.iter(|| {
+      script.run(scope).unwrap();
+    });
+  }
+}
+
+pub fn bench_js_async(
+  b: &mut Bencher,
+  src: &str,
+  setup: impl FnOnce(&mut JsRuntime),
+) {
+  let mut runtime = create_js_runtime(setup);
+  let tokio_runtime = tokio::runtime::Builder::new_current_thread()
+    .enable_all()
+    .build()
+    .unwrap();
+
+  // Looped code
+  let looped = loop_code(1000, src);
+  let src = looped.as_ref();
+
+  if is_profiling() {
+    for _ in 0..10000 {
+      runtime.execute("inner_loop", src).unwrap();
+      let future = runtime.run_event_loop();
+      tokio_runtime.block_on(future).unwrap();
+    }
+  } else {
+    b.iter(|| {
+      runtime.execute("inner_loop", src).unwrap();
+      let future = runtime.run_event_loop();
+      tokio_runtime.block_on(future).unwrap();
+    });
+  }
+}