benchmark: disambiguate filename and dirname read perf

PR-URL: https://github.com/nodejs/node/pull/58056
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

benchmark/esm/import-meta.js

@@ -1,32 +1,37 @@
 'use strict';
 
 const path = require('path');
-const { pathToFileURL, fileURLToPath } = require('url');
+const { pathToFileURL } = require('url');
 const common = require('../common');
 const assert = require('assert');
 const bench = common.createBenchmark(main, {
   n: [1000],
+  valuesToRead: [
+    'dirname-and-filename',
+    'dirname',
+    'filename',
+  ],
 });
 
-const file = pathToFileURL(
-  path.resolve(__filename, '../../fixtures/esm-dir-file.mjs'),
-);
-async function load(array, n) {
+const fixtureDir = path.resolve(__filename, '../../fixtures');
+const fixtureDirURL = pathToFileURL(fixtureDir);
+async function load(array, n, valuesToRead) {
   for (let i = 0; i < n; i++) {
-    array[i] = await import(`${file}?i=${i}`);
+    array[i] = await import(`${fixtureDirURL}/import-meta-${valuesToRead}.mjs?i=${i}`);
   }
   return array;
 }
 
-function main({ n }) {
+function main({ n, valuesToRead }) {
   const array = [];
   for (let i = 0; i < n; ++i) {
     array.push({ dirname: '', filename: '', i: 0 });
   }
 
   bench.start();
-  load(array, n).then((arr) => {
+  load(array, n, valuesToRead).then((arr) => {
     bench.end(n);
-    assert.strictEqual(arr[n - 1].filename, fileURLToPath(file));
+    if (valuesToRead.includes('dirname')) assert.strictEqual(arr[n - 1].dirname, fixtureDir);
+    if (valuesToRead.includes('filename')) assert.strictEqual(arr[n - 1].filename, path.join(fixtureDir, `import-meta-${valuesToRead}.mjs`));
   });
 }

benchmark/fixtures/import-meta-dirname.mjs

@@ -0,0 +1 @@
+export const dirname = import.meta.dirname;

benchmark/fixtures/import-meta-filename.mjs

@@ -0,0 +1 @@
+export const filename = import.meta.filename;