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

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5
   6 WebInspector.TimelineJSProfileProcessor = { };
   7
   8 /**
   9  * @param {!WebInspector.TracingTimelineModel} timelineModel
  10  * @param {!ProfilerAgent.CPUProfile} jsProfile
  11  * @return {!Array.<!WebInspector.TracingModel.Event>}
  12  */
  13 WebInspector.TimelineJSProfileProcessor.generateTracingEventsFromCpuProfile = function(timelineModel, jsProfile)
  14 {
  15     if (!jsProfile.samples)
  16         return [];
  17     var jsProfileModel = new WebInspector.CPUProfileDataModel(jsProfile);
  18     var idleNode = jsProfileModel.idleNode;
  19     var programNode = jsProfileModel.programNode;
  20     var gcNode = jsProfileModel.gcNode;
  21     var samples = jsProfileModel.samples;
  22     var timestamps = jsProfileModel.timestamps;
  23     var jsEvents = [];
  24     var mainThread = timelineModel.mainThreadEvents()[0].thread;
  25     for (var i = 0; i < samples.length; ++i) {
  26         var node = jsProfileModel.nodeByIndex(i);
  27         if (node === programNode || node === gcNode || node === idleNode)
  28             continue;
  29         var stackTrace = node._stackTraceArray;
  30         if (!stackTrace) {
  31             stackTrace = /** @type {!ConsoleAgent.StackTrace} */ (new Array(node.depth + 1));
  32             node._stackTraceArray = stackTrace;
  33             for (var j = 0; node.parent; node = node.parent)
  34                 stackTrace[j++] = /** @type {!ConsoleAgent.CallFrame} */ (node);
  35         }
  36         var jsEvent = new WebInspector.TracingModel.Event(WebInspector.TracingModel.DevToolsMetadataEventCategory, WebInspector.TracingTimelineModel.RecordType.JSSample,
  37             WebInspector.TracingModel.Phase.Instant, timestamps[i], mainThread);
  38         jsEvent.stackTrace = stackTrace;
  39         jsEvents.push(jsEvent);
  40     }
  41     return jsEvents;
  42 }