[class] add microbenchmark for defining class fields

Landing define-class-fields microbencharks upstream before optimization so that
the benefit is visible.

Bug: v8:9888
Change-Id: Ie3bd2bd2cdd5710f43e398aa834985b5faa973d5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2999030
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76267}

test/js-perf-test/ClassFields.json

+{
+  "owners": ["caitp@igalia.com", "joyee@igalia.com"],
+  "name": "ClassFields",
+  "run_count": 3,
+  "run_count_arm": 1,
+  "run_count_arm64": 1,
+  "timeout": 120,
+  "timeout_arm64": 240,
+  "units": "score",
+  "total": true,
+  "resources": ["base.js"],
+  "tests": [
+    {
+      "name": "ClassFields",
+      "path": ["ClassFields"],
+      "flags": ["--allow-natives-syntax"],
+      "resources": [ "define-public-field.js" ],
+      "results_regexp": "^%s\\-ClassFields\\(Score\\): (.+)$",
+      "tests": [
+        {
+          "name": "define-public-field-single-opt",
+          "main": "run.js",
+          "test_flags": [ "define-public-field", "single", "opt" ]
+        },
+        {
+          "name": "define-public-field-single-noopt",
+          "main": "run.js",
+          "test_flags": [ "define-public-field", "single", "noopt" ]
+        },
+        {
+          "name": "define-public-field-multiple-opt",
+          "main": "run.js",
+          "test_flags": [ "define-public-field", "multiple", "opt" ]
+        },
+        {
+          "name": "define-public-field-multiple-noopt",
+          "main": "run.js",
+          "test_flags": [ "define-public-field", "multiple", "noopt" ]
+        },
+        {
+          "name": "define-private-field-single-opt",
+          "main": "run.js",
+          "test_flags": [ "define-private-field", "single", "opt" ]
+        },
+        {
+          "name": "define-private-field-single-noopt",
+          "main": "run.js",
+          "test_flags": [ "define-private-field", "single", "noopt" ]
+        },
+        {
+          "name": "define-private-field-multiple-opt",
+          "main": "run.js",
+          "test_flags": [ "define-private-field", "multiple", "opt" ]
+        },
+        {
+          "name": "define-private-field-multiple-noopt",
+          "main": "run.js",
+          "test_flags": [ "define-private-field", "multiple", "noopt" ]
+        }
+      ]
+    }
+  ]
+}

test/js-perf-test/ClassFields/define-private-field.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+'use strict';
+
+const BENCHMARK_NAME = arguments[0];
+const TEST_TYPE = arguments[1];
+const optimize_param = arguments[2];
+let optimize;
+if (optimize_param == "opt") {
+  optimize = true;
+} else if (optimize_param == "noopt"){
+  optimize = false;
+} else {
+  throw new Error("Unknown optimization configuration " + arguments.join(' '));
+}
+
+let klass;
+let i = 0;
+let array;
+
+class SinglePrivateFieldClass {
+  #x = i;
+
+  check() {
+    return this.#x === i;
+  }
+}
+
+class MultiPrivateFieldClass {
+  #x = i;
+  #y = i+1;
+  #z = i+2;
+  #q = i+3;
+  #r = i+4;
+  #a = i+5;
+
+  check() {
+    return this.#x + 1 === this.#y && this.#y + 1 === this.#z &&
+           this.#z + 1 === this.#q && this.#q + 1 === this.#r &&
+           this.#r + 1 === this.#a;
+  }
+}
+
+switch (TEST_TYPE) {
+  case "single":
+    klass = SinglePrivateFieldClass;
+    break;
+  case "multiple":
+    klass = MultiPrivateFieldClass;
+    break;
+  default:
+    throw new Error("Unknown optimization configuration " + arguments.join(' '));
+}
+
+if (optimize) {
+  %PrepareFunctionForOptimization(klass);
+} else {
+  %NeverOptimizeFunction(klass);
+}
+
+function setUp() {
+  array = [new klass(), new klass()];
+  // Populate the array first to reduce the impact of
+  // array allocations.
+  for (let i = 0; i < LOCAL_ITERATIONS - 2; ++i) {
+    array.push(array[0]);
+  }
+  if (optimize) {
+    %OptimizeFunctionOnNextCall(klass);
+  }
+}
+
+function runBenchmark() {
+  for (let i = 0; i < LOCAL_ITERATIONS; ++i) {
+    array[i] = new klass();
+  }
+}
+
+function tearDown() {
+  if (array.length < 3) {
+    throw new Error(`Check failed, array length ${array.length}`);
+  }
+  for (const instance of array) {
+    if (!instance.check())
+      throw new Error(`instance.check() failed`);
+  }
+}
+
+const DETERMINISTIC_RUNS = 1;
+const LOCAL_ITERATIONS = 10000;
+new BenchmarkSuite(`${BENCHMARK_NAME}`, [1000], [
+  new Benchmark(
+    `${BENCHMARK_NAME}-${TEST_TYPE}-${optimize_param}`,
+    false, false, DETERMINISTIC_RUNS, runBenchmark, setUp, tearDown)
+]);

test/js-perf-test/ClassFields/define-public-field.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+'use strict';
+
+const BENCHMARK_NAME = arguments[0];
+const TEST_TYPE = arguments[1];
+const optimize_param = arguments[2];
+let optimize;
+if (optimize_param == "opt") {
+  optimize = true;
+} else if (optimize_param == "noopt"){
+  optimize = false;
+} else {
+  throw new Error("Unknown optimization configuration " + arguments.join(' '));
+}
+
+let klass;
+let i = 0;
+let array;
+
+class SinglePublicFieldClass {
+  x = i;
+
+  check() {
+    return this.x === i;
+  }
+}
+
+class MultiPublicFieldClass {
+  x = i;
+  y = i+1;
+  z = i+2;
+  q = i+3;
+  r = i+4;
+  a = i+5;
+
+  check() {
+    return this.x + 1 === this.y && this.y + 1 === this.z &&
+           this.z + 1 === this.q && this.q + 1 === this.r &&
+           this.r + 1 === this.a;
+  }
+}
+
+switch (TEST_TYPE) {
+  case "single":
+    klass = SinglePublicFieldClass;
+    break;
+  case "multiple":
+    klass = MultiPublicFieldClass;
+    break;
+  default:
+    throw new Error("Unknown optimization configuration " + arguments.join(' '));
+}
+
+if (optimize) {
+  %PrepareFunctionForOptimization(klass);
+} else {
+  %NeverOptimizeFunction(klass);
+}
+
+function setUp() {
+  array = [new klass(), new klass()];
+  // Populate the array first to reduce the impact of
+  // array allocations.
+  for (let i = 0; i < LOCAL_ITERATIONS - 2; ++i) {
+    array.push(array[0]);
+  }
+  if (optimize) {
+    %OptimizeFunctionOnNextCall(klass);
+  }
+}
+
+function runBenchmark() {
+  for (let i = 0; i < LOCAL_ITERATIONS; ++i) {
+    array[i] = new klass();
+  }
+}
+
+function tearDown() {
+  if (array.length < 3) {
+    throw new Error(`Check failed, array length ${array.length}`);
+  }
+
+  for (const instance of array) {
+    if (!instance.check())
+      throw new Error(`instance.check() failed`);
+  }
+}
+
+const DETERMINISTIC_RUNS = 1;
+const LOCAL_ITERATIONS = 10000;
+new BenchmarkSuite(`${BENCHMARK_NAME}`, [1000], [
+  new Benchmark(
+    `${BENCHMARK_NAME}-${TEST_TYPE}-${optimize_param}`,
+    false, false, DETERMINISTIC_RUNS, runBenchmark, setUp, tearDown)
+]);

test/js-perf-test/ClassFields/run.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+load('../base.js');
+load(arguments[0] + '.js');
+
+var success = true;
+
+function PrintResult(name, result, mean) {
+  print(`${name}-ClassFields(Score): ${result} (mean: ${mean})`);
+}
+
+
+function PrintError(name, error) {
+  PrintResult(name, error);
+  success = false;
+}
+
+
+BenchmarkSuite.config.doWarmup = undefined;
+BenchmarkSuite.config.doDeterministic = undefined;
+
+BenchmarkSuite.RunSuites({ NotifyResult: PrintResult,
+                           NotifyError: PrintError });