[js-perf-test] Adding micro benchmarks for for-in and keys patterns.

test/js-perf-test/Keys/keys.js

-// Copyright 2015 the V8 project authors. All rights reserved.
+// Copyright 2016 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.
 
 function ObjectWithKeys(count, keyOffset, keyGen) {
   if (keyOffset === undefined) keyOffset = 0;
   if (keyGen === undefined) keyGen = (i) => { return "key" + i };
   var o = {};
   for (var i = 0; i < count; i++) {
     var key = keyGen(i + keyOffset);
     o[key] = "value";
@@ skipping 39 matching lines @@
   for (var i = 0; i < size; i++) {
     array[i] = i;
   }
   return array;
 }
 
 // ============================================================================
 var object_empty = {};
 var array_empty = [];
 
-var array_int_100 = IntArray(100);
-var array_int_100_proto_elements = IntArray(100);
-array_int_100_proto_elements.__proto__ = [101, 102, 103, 104];
-var array_int_holey_100 = HoleyIntArray(100);
+var array_int_50 = IntArray(50);
+var array_int_50_proto_elements = IntArray(50);
+array_int_50_proto_elements.__proto__ = [51, 52, 53, 54];
+var array_int_holey_50 = HoleyIntArray(50);
 
 var empty_proto_5_10 = ObjectWithKeys(5);
 empty_proto_5_10.__proto__ = ObjectWithProtoKeys(10, 0);
 
 var empty_proto_5_5_slow = ObjectWithKeys(5);
 empty_proto_5_5_slow.__proto__ = ObjectWithProtoKeys(5, 0, false);
 
 var object_elements_proto_5_10 = ObjectWithKeys(5);
 object_elements_proto_5_10.__proto__ = ObjectWithProtoKeys(10, 0);
 // Add some properties further up the prototype chain, the rest stays
 // empty.
 for (var i = 0; i < 5; i++) {
   object_elements_proto_5_10.__proto__.__proto__.__proto__["proto" + i] = true;
 }
 
 var TestObjects = {
   object_empty: object_empty,
   array_empty: array_empty,
-  array_int_100: array_int_100,
-  array_int_holey_100: array_int_holey_100,
-  array_int_100_proto_elements: array_int_100_proto_elements,
+  array_int_50: array_int_50,
+  array_int_holey_50: array_int_holey_50,
+  array_int_50_proto_elements: array_int_50_proto_elements,
   empty_proto_5_10: empty_proto_5_10,
   empty_proto_5_5_slow: empty_proto_5_5_slow,
   object_elements_proto_5_10: object_elements_proto_5_10
 }
 
-var TestArrays =
-    {
-      array_empty: array_empty,
-      array_int_100: array_int_100,
-      array_int_holey_100: array_int_holey_100,
-      array_int_100_proto_elements: array_int_100_proto_elements
-    }
+var TestArrays = {
+  array_empty: array_empty,
+  array_int_50: array_int_50,
+  array_int_holey_50: array_int_holey_50,
+  array_int_50_proto_elements: array_int_50_proto_elements,
+}
 
 // ============================================================================
 
 function CreateTestFunctionGen(fn) {
   // Force a new function for each test-object to avoid side-effects due to ICs.
   return (object) => {
     var random_comment = "\n// random comment" + Math.random() + "\n";
     return eval(random_comment + fn.toString());
   }
 }
 
 var TestFunctions = {
   "Object.keys()": CreateTestFunctionGen(() => {return Object.keys(object)}),
-  "for (in)": CreateTestFunctionGen(() => {
+  "for-in": CreateTestFunctionGen(() => {
     var count = 0;
     var result;
     for (var key in object) {
       count++;
       result = object[key];
     };
     return [result, count];
   }),
-  "for (in) hasOwnProperty()": CreateTestFunctionGen(() => {
+  "for-in hasOwnProperty()": CreateTestFunctionGen(() => {
     var count = 0;
     var result;
     for (var key in object) {
       if (!object.hasOwnProperty(key)) continue;
       count++;
       result = object[key];
     };
     return [result, count];
   }),
   "for (i < Object.keys().length)": CreateTestFunctionGen(() => {
     var count = 0;
     var result;
-    var keys = Object.keys(object) for (var i = 0; i < keys.length; i++) {
+    var keys = Object.keys(object);
+    for (var i = 0; i < keys.length; i++) {
       count++;
       result = object[keys[i]];
     };
     return [result, count];
   }),
   "Object.keys().forEach()": CreateTestFunctionGen(() => {
     var count = 0;
     var result;
     Object.keys(object).forEach((value, index, obj) => {
       count++;
@@ skipping 19 matching lines @@
     var length = object.length;
     for (var i = 0; i < length; i++) {
       count++;
       result = object[i];
     };
     return [result, count];
   })
 }
 
 // ============================================================================
-
+// Create the benchmark suites. We create a suite for each of the test
+// functions above and each suite contains benchmarks for each object type.
 var Benchmarks = [];
 
 function NewBenchmark(
     test_function_gen, test_function_name, test_object, test_object_name) {
   var object = test_object;
   var name = test_function_name + " " + test_object_name;
   var test_function = test_function_gen(object);
   return new Benchmark(name, false, false, 0, test_function)
 }
 
 for (var test_function_name in TestFunctions) {
   var test_function_gen = TestFunctions[test_function_name];
   var benchmarks = [];
   for (var test_object_name in TestObjects) {
     var test_object = TestObjects[test_object_name];
     var benchmark = NewBenchmark(
         test_function_gen, test_function_name, test_object, test_object_name);
     benchmarks.push(benchmark);
   }
-  Benchmarks.push(new BenchmarkSuite(test_function_name, [1000], benchmarks));
+  Benchmarks.push(new BenchmarkSuite(test_function_name, [100], benchmarks));
 }
 
 for (var test_function_name in TestFunctionsArrays) {
   var test_function_gen = TestFunctionsArrays[test_function_name];
   var benchmarks = [];
   for (var test_array_name in TestArrays) {
     var test_array = TestArrays[test_array_name];
     var benchmark = NewBenchmark(
         test_function_gen, test_function_name, test_array, test_array_name);
     benchmarks.push(benchmark);
   }
-  Benchmarks.push(new BenchmarkSuite(test_function_name, [1000], benchmarks));
+  Benchmarks.push(new BenchmarkSuite(test_function_name, [100], benchmarks));
 }
 
 // ============================================================================