[DevTools] Better label for async function call stacks

third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1221 matching lines @@
  * @param {!RuntimeAgent.StackTrace=} asyncStackTrace
  */
 WebInspector.DebuggerPausedDetails = function(debuggerModel, callFrames, reason, auxData, breakpointIds, asyncStackTrace)
 {
     WebInspector.SDKObject.call(this, debuggerModel.target());
     this.debuggerModel = debuggerModel;
     this.callFrames = WebInspector.DebuggerModel.CallFrame.fromPayloadArray(debuggerModel, callFrames);
     this.reason = reason;
     this.auxData = auxData;
     this.breakpointIds = breakpointIds;
-    this.asyncStackTrace = asyncStackTrace;
+    if (asyncStackTrace)
+        this.asyncStackTrace = this._cleanRedundantFrames(asyncStackTrace);
 }
 
 WebInspector.DebuggerPausedDetails.prototype = {
     /**
      * @return {?WebInspector.RemoteObject}
      */
     exception: function()
     {
         if (this.reason !== WebInspector.DebuggerModel.BreakReason.Exception && this.reason !== WebInspector.DebuggerModel.BreakReason.PromiseRejection)
             return null;
         return this.target().runtimeModel.createRemoteObject(/** @type {!RuntimeAgent.RemoteObject} */(this.auxData));
     },
 
+    /**
+     * @param {!RuntimeAgent.StackTrace} asyncStackTrace
+     * @return {!RuntimeAgent.StackTrace}
+     */
+    _cleanRedundantFrames: function(asyncStackTrace)
+    {
+        var stack = asyncStackTrace;
+        var previous = null;
+        while (stack) {
+            if (stack.description === "async function" && stack.callFrames.length)
+                stack.callFrames.shift();
+            if (previous && !stack.callFrames.length)
+                previous.parent = stack.parent;
+            else
+                previous = stack;
+            stack = stack.parent;
+        }
+        return asyncStackTrace;
+    },
+
     __proto__: WebInspector.SDKObject.prototype
 }
 
 /**
  * @return {!Array<!WebInspector.DebuggerModel>}
  */
 WebInspector.DebuggerModel.instances = function()
 {
     var result = [];
     for (var target of WebInspector.targetManager.targets()) {
         var debuggerModel = WebInspector.DebuggerModel.fromTarget(target);
         if (debuggerModel)
             result.push(debuggerModel);
     }
     return result;
 }
 
 /**
  * @param {?WebInspector.Target} target
  * @return {?WebInspector.DebuggerModel}
  */
 WebInspector.DebuggerModel.fromTarget = function(target)
 {
     if (!target || !target.hasJSCapability())
         return null;
     return /** @type {?WebInspector.DebuggerModel} */ (target.model(WebInspector.DebuggerModel));
 }