DevTools: Initial implementation of line-level CPU profile.

third_party/WebKit/Source/devtools/front_end/timeline/TimelineJSProfile.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 WebInspector.TimelineJSProfileProcessor = { };
 
 /**
- * @param {!ProfilerAgent.CPUProfile} jsProfile
+ * @param {!WebInspector.CPUProfileDataModel} jsProfileModel
  * @param {!WebInspector.TracingModel.Thread} thread
  * @return {!Array<!WebInspector.TracingModel.Event>}
  */
-WebInspector.TimelineJSProfileProcessor.generateTracingEventsFromCpuProfile = function(jsProfile, thread)
+WebInspector.TimelineJSProfileProcessor.generateTracingEventsFromCpuProfile = function(jsProfileModel, thread)
 {
-    if (!jsProfile.samples)
-        return [];
-    var jsProfileModel = new WebInspector.CPUProfileDataModel(jsProfile);
     var idleNode = jsProfileModel.idleNode;
     var programNode = jsProfileModel.programNode;
     var gcNode = jsProfileModel.gcNode;
     var samples = jsProfileModel.samples;
     var timestamps = jsProfileModel.timestamps;
     var jsEvents = [];
     /** @type {!Map<!Object, !Array<!RuntimeAgent.CallFrame>>} */
     var nodeToStackMap = new Map();
     nodeToStackMap.set(programNode, []);
     for (var i = 0; i < samples.length; ++i) {
@@ skipping 459 matching lines @@
                 WebInspector.TracingModel.Phase.Instant, e.startTime, e.thread);
             sampleEvent.ordinal = e.ordinal;
             sampleEvent.args = {"data": {"stackTrace": stack }};
             samples.push(sampleEvent);
             break;
         }
     }
 
     return samples;
 }
+
+/**
+ * @param {!WebInspector.CPUProfileDataModel} profile
+ */
+WebInspector.TimelineJSProfileProcessor.buildLineLevelProfiles = function(profile)
+{
+    if (!Runtime.experiments.isEnabled("lineLevelProfile"))
+        return;
+    var nodesToGo = [profile.profileHead];
+    var sampleDuration = (profile.profileEndTime - profile.profileStartTime) / profile.totalHitCount;
+    /** @type {!Map<string, !Map<number,number>>} */
+    var files = new Map();
+    while (nodesToGo.length) {
+        var nodes = nodesToGo.pop().children;
+        for (var i = 0; i < nodes.length; ++i) {
+            var node = nodes[i];
+            if (!node.url)
+                continue;
+            var fileInfo = files.get(node.url);
+            if (!fileInfo) {
+                fileInfo = new Map();
+                files.set(node.url, fileInfo);
+            }
+            for (var j = 0; j < node.positionTicks.length; ++j) {
+                var lineInfo = node.positionTicks[j];
+                var line = lineInfo.line - 1;
+                var time = lineInfo.ticks * sampleDuration;
+                fileInfo.set(line, (fileInfo.get(line) || 0) + time);
+            }
+            nodesToGo.push(node);
+        }
+    }
+    for (var fileInfo of files) {
+        var uiSourceCode = WebInspector.workspace.uiSourceCodeForURL(fileInfo[0]);
+        if (!uiSourceCode)
+            continue;
+        var decorator = profileInfoDecorator.bind(null, fileInfo[1]);
+        for (var line of fileInfo[1].keys())
+            uiSourceCode.addLineMarker(line, decorator);

[pfeldman, 2016/03/02 19:48:59]

addLineMarker(line, "performance", fileInfo[1]);

[alph, 2016/03/03 02:02:52]

Done.

+    }
+    files.clear();
+
+    /**
+     * @param  {!Map<number, number>} fileInfo
+     * @param  {number} lineNumber
+     * @return {!{text: string, color: string}}
+     */
+    function profileInfoDecorator(fileInfo, lineNumber)
+    {
+        var time = fileInfo.get(lineNumber) || 0;
+        var text = WebInspector.UIString("%.1f\xa0ms", time);
+        var intensity = Number.constrain(Math.log10(1 + 2 * time) / 5, 0.02, 1);
+        var color = `rgba(255, 0, 0, ${intensity.toFixed(3)})`;
+        return { text: text, color: color };
+    }
+}
+
+WebInspector.TimelineJSProfileProcessor.resetLineLevelProfiles = function()
+{
+    if (!Runtime.experiments.isEnabled("lineLevelProfile"))
+        return;
+    WebInspector.workspace.uiSourceCodes().forEach(uiSourceCode => uiSourceCode.removeAllLineMarkers());
+}