perf(change_detection): add baseline to change detection benchmark

modules/benchmarks/src/change_detection/benchmark.dart

@@ -4,8 +4,5 @@ import './change_detection_benchmark.dart' as cdb;
 import 'dart:js' as js;
 
 main () {
-  js.context['benchmarkSteps'].add(new js.JsObject.jsify({
-      "name": "Change Detection",
-      "fn": new js.JsFunction.withThis((_) => cdb.run())
-  }));
+  cdb.run();
 }

modules/benchmarks/src/change_detection/benchmark.es5

@@ -1,3 +1,3 @@
 System.import('benchmarks/change_detection/change_detection_benchmark').then(function (bm) {
-  window.benchmarkSteps.push({name: 'ChangeDetection', fn: bm.run});
+  bm.run();
 }, console.log.bind(console));

modules/benchmarks/src/change_detection/change_detection_benchmark.js

@@ -2,6 +2,8 @@ import {ListWrapper, MapWrapper} from 'facade/collection';
 import {Parser} from 'change_detection/parser/parser';
 import {Lexer} from 'change_detection/parser/lexer';
 import {reflector} from 'reflection/reflection';
+import {isPresent} from 'facade/lang';
+import {benchmark, benchmarkStep} from '../benchpress';
 
 import {
   ChangeDetector,
@@ -10,51 +12,175 @@ import {
 } from 'change_detection/change_detector';
 
 
-var ITERATIONS = 100000;
+var ITERATIONS = 200000;
+
+class Obj {
+  field0;
+  field1;
+  field2;
+  field3;
+  field4;
+  field5;
+  field6;
+  field7;
+  field8;
+  field9;
+
+
+  setField(index, value) {
+    switch (index) {
+      case 0: this.field0 = value; break;
+      case 1: this.field1 = value; break;
+      case 2: this.field2 = value; break;
+      case 3: this.field3 = value; break;
+      case 4: this.field4 = value; break;
+      case 5: this.field5 = value; break;
+      case 6: this.field6 = value; break;
+      case 7: this.field7 = value; break;
+      case 8: this.field8 = value; break;
+      case 9: this.field9 = value; break;
+    }
+  }
+}
+
+class Row {
+  previousValue;
+  obj;
+  getter;
+  next;
+}
+
+function setUpReflector() {
+  reflector.registerGetters({
+    'field0': function(obj){return obj.field0},
+    'field1': function(obj){return obj.field1},
+    'field2': function(obj){return obj.field2},
+    'field3': function(obj){return obj.field3},
+    'field4': function(obj){return obj.field4},
+    'field5': function(obj){return obj.field5},
+    'field6': function(obj){return obj.field6},
+    'field7': function(obj){return obj.field7},
+    'field8': function(obj){return obj.field8},
+    'field9': function(obj){return obj.field9}
+  });
+  reflector.registerSetters({
+    'field0': function(obj, v){return obj.field0 = v},
+    'field1': function(obj, v){return obj.field1 = v},
+    'field2': function(obj, v){return obj.field2 = v},
+    'field3': function(obj, v){return obj.field3 = v},
+    'field4': function(obj, v){return obj.field4 = v},
+    'field5': function(obj, v){return obj.field5 = v},
+    'field6': function(obj, v){return obj.field6 = v},
+    'field7': function(obj, v){return obj.field7 = v},
+    'field8': function(obj, v){return obj.field8 = v},
+    'field9': function(obj, v){return obj.field9 = v}
+  });
+}
+
+function setUpBaseline() {
+  function createRow(i) {
+    var obj = new Obj();
+    var index = i % 10;
+    obj.setField(index, i);
+
+    var r = new Row();
+    r.obj = obj;
+    r.previousValue = i;
+    r.getter = reflector.getter(`field${index}`);
+    return r;
+  }
+
+  var head = createRow(0);
+  var current = head;
+  for (var i = 1; i < ITERATIONS; i++) {
+    var newRow = createRow(i);
+    current.next = newRow;
+    current = newRow;
+  }
+  return head;
+}
+
+function setUpChangeDetection() {
+  var dispatcher = new DummyDispatcher();
+  var parser = new Parser(new Lexer());
+
+  var parentProto = new ProtoRecordRange();
+  var parentRange = parentProto.instantiate(dispatcher, MapWrapper.create());
+
+  var astWithSource = [
+    parser.parseBinding('field0'),
+    parser.parseBinding('field1'),
+    parser.parseBinding('field2'),
+    parser.parseBinding('field3'),
+    parser.parseBinding('field4'),
+    parser.parseBinding('field5'),
+    parser.parseBinding('field6'),
+    parser.parseBinding('field7'),
+    parser.parseBinding('field8'),
+    parser.parseBinding('field9')
+  ];
+
+  function proto(i) {
+    var prr = new ProtoRecordRange();
+    prr.addRecordsFromAST(astWithSource[i % 10].ast, "memo", i, false);
+    return prr;
+  }
+
+  var prr = [
+    proto(0),
+    proto(1),
+    proto(2),
+    proto(3),
+    proto(4),
+    proto(5),
+    proto(6),
+    proto(7),
+    proto(8),
+    proto(9)
+  ];
+
+  for (var i = 0; i < ITERATIONS; ++i) {
+    var obj = new Obj();
+    var index = i % 10;
+    obj.setField(index, i);
+
+    var rr = prr[index].instantiate(dispatcher,  null);
+    rr.setContext(obj);
+
+    parentRange.addRange(rr);
+  }
+
+  return new ChangeDetector(parentRange);
+}
 
 export function run () {
-  reflector.registerGetters({
-    'a': function(obj){return obj.a},
-    'b': function(obj){return obj.b},
-    'c': function(obj){return obj.c}
+  setUpReflector();
+
+  benchmark(`Baseline`, function () {
+    var head = setUpBaseline();
+
+    benchmarkStep('run', function () {
+      var current = head;
+      while (isPresent(current)) {
+        if (current.getter(current.obj) !== current.previousValue) {
+          throw "should not happen";
+        }
+        current = current.next;
+      }
+    });
   });
 
-  reflector.registerSetters({
-    'a': function(obj, v){return obj.a = v},
-    'b': function(obj, v){return obj.b = v},
-    'c': function(obj, v){return obj.c = v}
+  benchmark(`Change Detection`, function() {
+    var cd = setUpChangeDetection();
+
+    benchmarkStep('run', function() {
+      cd.detectChanges();
+    });
   });
-
-  var parser = new Parser(new Lexer());
-  var astWithSource = parser.parseBinding('a + b * c');
-
-  var prr = new ProtoRecordRange();
-  prr.addRecordsFromAST(astWithSource.ast, 'memo', false);
-
-  var dispatcher = new DummyDispatcher();
-  var rr = prr.instantiate(dispatcher, MapWrapper.create());
-  rr.setContext(new Component());
-
-  var cd = new ChangeDetector(rr);
-  for (var i = 0; i < ITERATIONS; ++i) {
-    cd.detectChanges();
-  }
 }
 
 
 class DummyDispatcher extends WatchGroupDispatcher {
   onRecordChange(record, context) {
   }
-}
-
-class Component {
-  a:number;
-  b:number;
-  c:number;
-
-  constructor() {
-    this.a = 1;
-    this.b = 2;
-    this.c = 3;
-  }
 }

modules/change_detection/src/change_detector.js

@@ -22,10 +22,6 @@ export class ChangeDetector {
       var currentRange = record.recordRange;
       var currentGroup = record.groupMemento();
 
-      var nextEnabled = record.nextEnabled;
-      var nextRange = isPresent(nextEnabled) ? nextEnabled.recordRange : null;
-      var nextGroup = isPresent(nextEnabled) ? nextEnabled.groupMemento() : null;
-
       if (record.check()) {
         count ++;
         if (record.terminatesExpression()) {
@@ -33,9 +29,15 @@ export class ChangeDetector {
         }
       }
 
-      if (this._shouldNotifyDispatcher(currentRange, nextRange, currentGroup, nextGroup, updatedRecords)) {
-        currentRange.dispatcher.onRecordChange(currentGroup, updatedRecords);
-        updatedRecords = null;
+      if (isPresent(updatedRecords)) {
+        var nextEnabled = record.nextEnabled;
+        var nextRange = isPresent(nextEnabled) ? nextEnabled.recordRange : null;
+        var nextGroup = isPresent(nextEnabled) ? nextEnabled.groupMemento() : null;
+
+        if (currentRange != nextRange || currentGroup != nextGroup) {
+          currentRange.dispatcher.onRecordChange(currentGroup, updatedRecords);
+          updatedRecords = null;
+        }
       }
 
       record = record.nextEnabled;
@@ -44,14 +46,6 @@ export class ChangeDetector {
     return count;
   }
 
-  _groupChanged(currentRange, nextRange, currentGroup, nextGroup) {
-    return currentRange != nextRange || currentGroup != nextGroup;
-  }
-
-  _shouldNotifyDispatcher(currentRange, nextRange, currentGroup, nextGroup, updatedRecords) {
-    return this._groupChanged(currentRange, nextRange, currentGroup, nextGroup) && isPresent(updatedRecords);
-  }
-
   _addRecord(updatedRecords:List, record:Record) {
     if (isBlank(updatedRecords)) {
       updatedRecords = _singleElementList;