feat(ops): reland fast zero copy string arguments (#17996)

Reland https://github.com/denoland/deno/pull/16777

The codegen is disabled in async ops and when fallback to slow call is
possible (return type is a Result) to avoid hitting this V8 bug:
https://github.com/denoland/deno/issues/17159

1 files changed, 21 insertions, 0 deletions

diff --git a/cli/bench/webstorage.js b/cli/bench/webstorage.js
new file mode 100644
index 000000000..ceebc5e35
--- /dev/null
+++ b/cli/bench/webstorage.js
@@ -0,0 +1,21 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+// Note: when benchmarking across different Deno version, make sure to clear
+// the DENO_DIR cache.
+let [total, count] = typeof Deno !== "undefined" ? Deno.args : [];
+
+total = total ? parseInt(total, 0) : 50;
+count = count ? parseInt(count, 10) : 1000000;
+
+function bench(fun) {
+  const start = Date.now();
+  for (let i = 0; i < count; i++) fun(i);
+  const elapsed = Date.now() - start;
+  const rate = Math.floor(count / (elapsed / 1000));
+  console.log(`time ${elapsed} ms rate ${rate}`);
+  if (--total) queueMicrotask(() => bench(fun));
+}
+
+localStorage.clear();
+localStorage.setItem("foo", "bar");
+bench(() => localStorage.getItem("foo"));